4.1 Studying Atoms Ancient Greek Models of Atoms
|
|
|
- Irma McDowell
- 6 years ago
- Views:
Transcription
1 Studying the structure of atoms is a little like studying wind. Because you cannot see air, you must use indirect evidence to tell the direction of the wind. Atoms pose a similar problem because they are extremely small. Even with a microscope, scientists cannot see the structure of an atom.
2 Ancient Greek Models of Atoms If you cut a piece of aluminum foil in half, you have two smaller pieces of the same shiny, flexible substance. You could cut the pieces again and again. Can you keep dividing the aluminum into smaller pieces? Greek philosophers debated a similar question about 2500 years ago.
3 Ancient Greek Models of Atoms The philosopher Democritus believed that all matter consisted of extremely small particles that could not be divided. He called these particles atoms from the Greek word atomos, which means uncut or indivisible.
4 Ancient Greek Models of Atoms Aristotle thought that all substances were made of only four elements earth, air, fire, and water. He did not think there was a limit to the division of matter. For many centuries, most people accepted Aristotle s views on the structure of matter. By the 1800s, scientists had enough experimental data to support an atomic model.
5 Dalton s Atomic Theory What was Dalton s theory of the structure of matter? Dalton proposed the theory that all matter is made up of individual particles called atoms, which cannot be divided.
6 Dalton s Atomic Theory Evidence for Atoms John Dalton studied the behavior of gases in air. Based on the way gases exert pressure, Dalton correctly concluded that a gas consists of individual particles. Dalton measured masses of elements that combine when compounds form. The ratio of the masses of the elements in each compound was always the same. In other words, compounds have a fixed composition.
7 Dalton s Atomic Theory When magnesium burns, it combines with oxygen. In magnesium oxide, the ratio of the mass of magnesium to the mass of oxygen is always about 3 : 2. Magnesium dioxide has a fixed composition.
8 Dalton s Atomic Theory Dalton s Theory All elements are composed of atoms. All atoms of the same element have the same mass, and atoms of different elements have different masses. Compounds contain atoms of more than one element. In a particular compound, atoms of different elements always combine in the same way.
9 Dalton s Atomic Theory Dalton made these wooden spheres as a model to represent the atoms of different elements. A tiny, solid sphere with a different mass represents each type of atom.
10 Dalton s Atomic Theory A theory must explain the data from many experiments. Because Dalton s atomic theory met that goal, the theory became widely accepted. Over time, scientists found that not all of Dalton s ideas about atoms were completely correct. They revised the theory to take into account new discoveries.
11 Thomson s Model of the Atom What contributions did Thomson make to the development of atomic theory? Thomson s experiments provided the first evidence that atoms are made of even smaller particles.
12 Thomson s Model of the Atom When some materials are rubbed, they gain the ability to attract or repel other materials. Such materials are said to have either a positive or a negative electric charge. Objects with like charges repel, or push apart. Objects with opposite charges attract, or pull together.
13 Thomson s Model of the Atom Amber is the hardened form of a sticky, viscous liquid that protects trees from insects and disease. If amber is rubbed with wool, it becomes charged and can attract a feather.
14 Thomson s Model of the Atom Thomson s Experiments In his experiments, Joseph John Thomson used a sealed tube containing a very small amount of gas. Sealed tube filled with gas at low pressure Glowing beam Metal disk Metal disk Source of electric current Metal disk Source of electric current
15 Thomson s Model of the Atom Thomson s Experiments In his experiments, Joseph John Thomson used a sealed tube containing a very small amount of gas. Sealed tube filled with gas at low pressure Glowing beam Positive plate Metal disk Negative plate Metal disk Source of electric current Metal disk Source of electric current
16 Thomson s Model of the Atom When the current was turned on, the disks became charged, and a glowing beam appeared in the tube. Thomson hypothesized that the beam was a stream of charged particles that interacted with the air in the tube and caused the air to glow. Thomson observed that the beam was repelled by the negatively charged plate and attracted by the positively charged plate.
17 Thomson s Model of the Atom Evidence for Subatomic Particles Thomson concluded that the particles in the beam had a negative charge because they were attracted to the positive plate. He hypothesized that the particles came from inside atoms because no matter what metal Thomson used for the disk, the particles produced were identical. the particles had about 1/2000 the mass of a hydrogen atom, the lightest atom.
18 Thomson s Model of the Atom Thomson s Model Thomson revised Dalton s model to account for these subatomic particles. The atom has neither a positive nor a negative charge, but there must always be some positive charge in the atom. The atom is filled with a positively charged mass of matter that has negative charges evenly scattered throughout it.
19 Thomson s Model of the Atom Thomson s model is called the plum pudding model. Today, it might be called the chocolate chip ice cream model. The chips represent negatively charged particles, which are spread evenly through a mass of positively charged matter the vanilla ice cream.
20 Rutherford s Atomic Theory What contributions did Rutherford make to the development of atomic theory? According to Rutherford s model, all of an atom s positive charge is concentrated in its nucleus.
21 Rutherford s Atomic Theory Rutherford s Hypothesis Ernest Rutherford designed an experiment to find out what happens to alpha particles when they pass through a thin sheet of gold. Alpha particles are fastmoving, positively charged particles. Based on Thomson s model, Rutherford hypothesized that the mass and charge at any location in the gold would be too small to change the path of an alpha particle. He predicted that most particles would travel in a straight path from their source to a screen that lit up when struck.
22 Rutherford s Atomic Theory The Gold Foil Experiment Deflected particle Undeflected particle Alpha particles Slit Gold atoms Beam of alpha particles Screen Alpha particles Source of alpha particles Nucleus
23 Rutherford s Atomic Theory Discovery of the Nucleus The alpha particles whose paths were deflected must have come close to another charged object. The closer they came, the greater the deflection. However, many alpha particles passed through the gold without being deflected. These particles did not pass close to a charged object.
24 Rutherford s Atomic Theory Thomson s model did not explain all of the evidence from Rutherford's experiment. Rutherford proposed a new model. The positive charge of an atom is not evenly spread throughout the atom. Positive charge is concentrated in a very small, central area. The nucleus of the atom is a dense, positively charged mass located in the center of the atom.
25 Rutherford s Atomic Theory The Houston Astrodome occupies more than nine acres and seats 60,000 people. If the stadium were a model for an atom, a marble could represent its nucleus. The total volume of an atom is about a trillion (10 12 ) times the volume of its nucleus.
26 Assessment Questions 1. Dalton s theory did not include which of the following points? a. All elements are composed of atoms. b. Most of an atom s mass is in its nucleus. c. Compounds contain atoms of more than one element. d. In a specific compound, atoms of different elements always combine in the same way.
27 Assessment Questions 1. Dalton s theory did not include which of the following points? a. All elements are composed of atoms. b. Most of an atom s mass is in its nucleus. c. Compounds contain atoms of more than one element. d. In a specific compound, atoms of different elements always combine in the same way. ANS: B
28 Assessment Questions 2. J. J. Thomson s experiments provided the first evidence of a. atoms. b. a nucleus. c. subatomic particles. d. elements.
29 Assessment Questions 2. J. J. Thomson s experiments provided the first evidence of a. atoms. b. a nucleus. c. subatomic particles. d. elements. ANS: C
30 Assessment Questions 1. The concept of an atom as a small particle of matter that cannot be divided was proposed by the ancient Greek philosopher, Democritus. True False
31 Assessment Questions 1. The concept of an atom as a small particle of matter that cannot be divided was proposed by the ancient Greek philosopher, Democritus. True False ANS: T
Ancient Greek Models of Atoms
Atomic Theory Ancient Greek Models of Atoms The philosopher Democritus believed that all matter consisted of extremely small particles that could not be divided. He called these particles atoms from the
HIGH SCHOOL SCIENCE. Physical Science 9: Atomic Structure
HIGH SCHOOL SCIENCE Physical Science 9: Atomic Structure WILLMAR PUBLIC SCHOOL 2013-2014 EDITION CHAPTER 9 Atomic Structure In this chapter you will: 1. Compare and contrast quarks, leptons, and bosons.
4.1 Studying Atoms. atomic models. Dry. Cold. Section Resources
Section 4.1 4.1 Studying Atoms 1 FOCUS Objectives 4.1.1 Describe ancient Greek models of matter. 4.1.2 List the main points of Dalton s atomic theory and describe his evidence for the existence of atoms.
Dalton Thompson Rutherford Bohr Modern Model ("Wave. Models of the Atom
Dalton Thompson Rutherford Bohr Modern Model ("Wave Models of the Atom Mechanical" Model) Aim: To discuss the scientists and their contributions to the current atomic model. Focus: Rutherford's Gold Foil
The Development of Atomic Theory
The Development of Atomic Theory Ideas & Theories in Science Change Our theory about the atom has changed over time as new studies are done. Even though no one has ever seen an atom up close we are still
Chapter 4: Atomic Structure Section 4.1 Defining the Atom
Chapter 4: Atomic Structure Section 4.1 Defining the Atom Early Models of the Atom atom the smallest particle of an element that retains its identity in a chemical reaction Democritus s Atomic Philosophy
Early Atomic Models. Atoms: the smallest particle of an element that retains the properties of that element.
Chapter 5 Early Atomic Models Atoms: the smallest particle of an element that retains the properties of that element. (Greek: atomos = indivisible) Democritus (Greek teacher in the 4 th century BC) First
1 The Development of Atomic Theory
CHAPTER 4 1 The Development of Atomic Theory SECTION Atoms KEY IDEAS As you read this section, keep these questions in mind: What scientists helped to develop atomic theory? What part of atoms did Thomson
Atomic Structure. For thousands of years, people had many ideas about matter Ancient Greeks believed that everything was made up of the four elements
An atom is the smallest particle of an element that retains its identity in a chemical reaction. Although early philosophers and scientists could not observe individual atoms, they were still able to propose
General Chemistry Standard : Identify the significance of the various outcomes of Thomson s and Rutherford s experiments
Not the history of the atom, but the idea of the atom The atom was not discovered until recently Original Idea Ancient Greece (400 BC) Proposed by lesser-known scientists They looked at a beach made of
4.2 Structure of the Nuclear Atom > Chapter 4 Atomic Structure. 4.2 Structure of the Nuclear Atom. 4.1 Defining the Atom
Chapter 4 Atomic Structure 4.1 Defining the Atom 4.2 Structure of the Nuclear Atom 4.3 Distinguishing Among Atoms 1 CHEMISTRY & YOU How did scientists determine the structures that are inside an atom?
Chapter 4. History of the atom. History of Atom Smallest possible piece? Atomos - not to be cut. Atoms and their structure
Chapter 4 Atoms and their structure History of the atom Not the history of atom, but the idea of the atom. Original idea Ancient Greece (400 B.C.) Democritus and Leucippus Greek philosophers. Looked at
Early Ideas About Matter
Early Ideas About Matter Democritus (460 370 BC) believed that matter is made of small, solid objects called atomos, from which the English word atom is derived. Early Ideas About Matter (cont.) Aristotle
SNC1D1 History of the Atom
SNC1D1 History of the Atom What is the atom? Atoms are the building block for all matter: Atoms make up elements! Elements combine to make compounds!2 ATOMIC MODEL TIMELINE 400 B.C PRESENT DAY ATOMIC MODEL
DEMOCRITUS - A philosopher in the year 400 B.C. - He didn t do experiments and he wondered if atoms kept on being divided, that there would only be
DEMOCRITUS A philosopher in the year 400 B.C. He didn t do experiments and he wondered if atoms kept on being divided, that there would only be one undividable particle left. He discovered that this was
Write the letter that best answers the question or completes the statement on the line provided.
Chapter 4 Atomic Structure Chapter Test A Multiple Choice Write the letter that best answers the question or completes the statement on the line provided. 1. Democritus thought that matter was made of
1 Development of the Atomic Theory
CHAPTER 4 1 Development of the Atomic Theory SECTION Introduction to Atoms BEFORE YOU READ After you read this section, you should be able to answer these questions: What is the atomic theory? How has
In many ways, Dalton's ideas are still useful today. For example, they help us to understand elements, compounds, and molecules.
History of the Atom Name: Reading excerpt from Absorb Chemistry for GCSE by Lawrie Ryan http://www.absorblearning.com/chemistry/demo/units/lr301.html Introduction Our understanding of the physical world
Chemistry Chapter 3. Atoms: The Building Blocks of Matter
Chemistry Chapter 3 Atoms: The Building Blocks of Matter I. From Philosophical Idea to Scientific Theory History of the Atom The Ancient Greeks were the first to come up with the idea of the atom. Democritus
Chapter 11 Study Questions Name: Class:
Chapter 11 Study Questions Name: Class: Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. The discovery of which particle proved that the atom
Early Models of the Atom
Early Models of the Atom An atom is the smallest particle of an element that retains its identity in a chemical reaction. Although early philosophers and scientists could not observe individual atoms,
Get out your diagram from your research paper. Get out a sheet of paper to take some notes on.
Bellwork: Get out your diagram from your research paper. Get out a sheet of paper to take some notes on. Fill in the Following Table in your notes (assume an atom unless otherwise stated: Symbol Protons
The Structure of the Atom
Main Ideas Atoms contain positive and negative particles. Atoms have small, dense, positively-charged nuclei. A nucleus contains protons and neutrons. The radii of atoms are expressed in picometers. FIGURE
Chemistry. Robert Taggart
Chemistry Robert Taggart Table of Contents To the Student..................................................v Unit 1: Matter and Measurement Lesson 1: Chemistry and the Scientific Method...................3
The structure of Atom III
The structure of Atom III Atomic Structure If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generations of creatures, what statement
History of the Atom. Say Thanks to the Authors Click (No sign in required)
History of the Atom Say Thanks to the Authors Click http://www.ck12.org/saythanks (No sign in required) To access a customizable version of this book, as well as other interactive content, visit www.ck12.org
Particle Theory of Matter. By the late 1700s, scientists had adopted the Particle Theory of Matter. This theory states that:
Particle Theory of Matter By the late 1700s, scientists had adopted the Particle Theory of Matter. This theory states that: all matter is made up of very tiny particles each pure substance has its own
Passing an electric current makes a beam appear to move from the negative to the positive end.
Chapter 4 Atoms and their structure History of the atom Not the history of atom, but the idea of the atom. Original idea Ancient Greece (400 B.C.) Democritus and Leucippus Greek philosophers. Smallest
Understanding the Atom
Understanding the Atom CHAPTER 9 LESSON 1 Discovering Parts of an Atom What do you think? Read the three statements below and decide whether you agree or disagree with them. Place an A in the Before column
Democritus thought atoms were indivisible & indestructible Lacked experimental support 4 th century B.C.
Chapter 5 Democritus thought atoms were indivisible & indestructible Lacked experimental support 4 th century B.C. Democritus thought atoms were indivisible & indestructible Lacked experimental support
Atomic Structure. History of Atomic Theory
Atomic Structure History of Atomic Theory Democritus (460-370 BC) Was the to come up with the idea of atom Believed that all matter was composed of Which is derived from the Greek word Atomos meaning He
Origins of the Atom. Atoms: The Building Blocks of Matter. Let s Get Ready to Rumble. Aristotle s Theory of the Atom CHAPTER 3
Origins of the Atom CHAPTER 3 Atoms: The Building Blocks of Matter Let s Get Ready to Rumble The idea of the atom was met with great skepticism, especially among great thinkers. The most vocal critic of
1. Based on Dalton s evidence, circle the drawing that demonstrates Dalton s model.
Various models of the ATOM Dalton Model John Dalton developed the first atomic model in 1808. Before him people, mostly philosophers, had speculated about the smallest unit of matter and two theories prevailed.
Card 1 Chapter 18. Card 2. Chapter 18. Negative particles that surround the nucleus (like planets around the sun)
Card 1 Card 2 Positive particles in the nucleus of the atom Negative particles that surround the nucleus (like planets around the sun) Card 3 Card 4 Neutral particles in the nucleus of the atom. They help
Rhonda Alexander IC Science Robert E. Lee
Rhonda Alexander IC Science Robert E. Lee Atom The smallest particle of an element that retains all of the chemical properties of the element. The Theory & Evidence for John Dalton s Atomic Theory: Around
7.1 Development of a Modern Atomic Theory
7.1 Development of a Modern Atomic Theory Development of the Atomic Theory Many scientists in different countries have contributed to the understanding of matter - atoms John Dalton Credited with developing
CHEMISTRY 11 UNIT REVIEW: ATOMIC THEORY & PERIODIC TRENDS
CHEMISTRY 11 UNIT REVIEW: ATOMIC THEORY & PERIODIC TRENDS Atoms Atoms have protons and neutrons located in the nucleus of the atom. Electrons orbit around the nucleus in well-defined paths. Protons have
Development of Atomic Theory Elements of chemistry- Atoms, the building blocks of matter Video
Development of Atomic Theory Elements of chemistry- Atoms, the building blocks of matter Video 2 CH 4- Atoms 1 Discovering the Atom In this lesson we will take a look at the scientists who explored the
Directed Reading B. Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY. is a(n). DALTON S ATOMIC THEORY BASED ON EXPERIMENTS
Skills Worksheet Directed Reading B Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY 1. The word atom comes from the Greek word atomos, which means a. dividable. b. invisible. c.
1 Development of the Atomic Theory
CHAPTER 11 1 Development of the Atomic Theory SECTION Introduction to Atoms BEFORE YOU READ After you read this section, you should be able to answer these questions: What is the atomic theory? How has
Chapter 4. Atomic Structure
Chapter 4 Atomic Structure Warm Up We have not yet discussed this material, but what do you know already?? What is an atom? What are electron, neutrons, and protons? Draw a picture of an atom from what
Scientist wanted to understand how the atom looked. It was known that matter was neutral. It was known that matter had mass
Atom Models Scientist wanted to understand how the atom looked It was known that matter was neutral It was known that matter had mass They used these ideas to come up with their models, however science
Name... Class... Date... In this activity you will have an opportunity to explore the nuclear model of the atom by building your own.
Model of an atom Specification references: C1.1.4 Relative electrical charges of subatomic particles C1.1.5 Size and mass of atoms WS 1.2 Aims In this activity you will have an opportunity to explore the
Warm Up 9/17/12. How long have people been interested in understanding matter and its structure? A. Thousands of years. B.
Warm Up 9/17/12 How long have people been interested in understanding matter and its structure? A. Thousands of years B. Hundreds of years C. A few years D. Never What is an atom? The smallest particle
democritus (~440 bc) who was he? theorized: A Greek philosopher
democritus (~440 bc) who was he? A Greek philosopher theorized: Everything in the world is made up small particles that we cannot see The shape of these particles determine the properties of a substance
Atomic Theory. The History of Atomic Theory
Atomic Theory The History of Atomic Theory This model of the atom may look familiar to you. This is the Bohr model. In this model, the nucleus is orbited by electrons, which are in different energy levels.
9/13/2011. The Greek Philosophers. Atomic Structure & The Periodic Table. Dalton s Atomic Theory. J. J. Thomson. Thomson s Experiment
Atomic Structure & The Periodic Table The Greek Philosophers Democritus believed that all matter is made up of tiny particles that could not be divided Aristotle -- thought that matter was made of only
Bellwork: 2/6/2013. atom is the. atom below. in an atom is found in the. mostly. 2. The smallest part of an. 1. Label the parts of the
Bellwork: 2/6/2013 1. Label the parts of the atom below. B 2. The smallest part of an atom is the. 3. The majority of the mass in an atom is found in the. A C 4. An atom is made up of mostly. Bellwork:
Greek Philosophers (cont.)
Greek Philosophers (cont.) Many ancient scholars believed matter was composed of such things as earth, water, air, and fire. Many believed matter could be endlessly divided into smaller and smaller pieces.
Atoms and their structure
Atoms and their structure History of atomic theory Not the history of atom, but the idea of the atom Original idea Ancient Greece (400 B.C..) Democritus and Leucippus Greek philosophers Another Greek Aristotle
Chapter 3 https://youtu.be/thndxfdkzzs?list=pl8dpuualjx tphzzyuwy6fyeax9mqq8ogr
Chapter 3 https://youtu.be/thndxfdkzzs?list=pl8dpuualjx tphzzyuwy6fyeax9mqq8ogr The smallest particle of an element that retains the chemical properties of that element. Regions: Nucleus: very small region
Early Atomic Theory. Alchemy. The atom
Early Atomic Theory Chapter 3 Democritus 460 BC- ~ 370 BC Nothing exists except atoms and empty space; everything else is opinion. Matter is composed of small indivisible particles, atomos meaning Indivisible
Chemistry Day 7. Friday, September 7 th Monday, September 10 th, 2018
Chemistry Day 7 Friday, September 7 th Monday, September 10 th, 2018 Do-Now Title: Ch. 13/14 Notes C 1. Write down today s FLT 2. List the three states of matter and list an example for each 3. List two
Atom s Structure. Chemistry is the study of the structure, characteristics and behavior of matter. The basic
AlMarzooqi 1 Hamad AlMarzooqi Professor Kafle ESL 015 26 February 2013 Atom s Structure Chemistry is the study of the structure, characteristics and behavior of matter. The basic unit of matter is an atom,
The History of Atomic Theory Chapter 3--Chemistry
The History of Atomic Theory Chapter 3--Chemistry In this lesson, we ll learn about the men whose quests for knowledge about the fundamental nature of the universe helped define our views. The atomic model
History of the OBJECTIVES. ESSENTIAL QUESTION What evidence is there for the existence of atoms and their sub-atomic particles?
History of the 09/15/2016 OBJECTIVES Understand the law of definite proportions. Define a scientific law and identify how observations become a law. Explain that a scientific theory is not established
9/23/2012. Democritus 400 B.C. Greek philosopher Proposed that all materials are made from atoms. Coined Greek word atmos, meaning indivisible.
Mr. Sudbury Atoms are too small to see with your eyes. Atoms are too small to see with the most powerful microscopes. Scientist use models to explain atoms. A scientific model is an representation containing
Name Date Class DEFINING THE ATOM
4.1 DEFINING THE ATOM Section Review Objectives Describe Democritus s ideas about atoms Explain Dalton s atomic theory Describe the size of an atom Vocabulary atom Dalton s atomic theory Part A Completion
Atomic Structure. A model uses familiar ideas to explain unfamiliar facts observed in nature.
Atomic Structure 1 2 This model of the atom may look familiar to you. This is the Bohr model. In this model, the nucleus is orbited by electrons, which are in different energy levels. A model uses familiar
Name Class Date. Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY
Skills Worksheet Directed Reading A Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY Write the letter of the correct answer in the space provided. 1. Around 440 BCE, who thought
What is matter? Matter is anything that has mass and takes up space. What is matter made of??
What is matter? Matter is anything that has mass and takes up space What is matter made of?? Atoms. All matter is made of atoms. Atoms are the building blocks of Matter Remember???? The Cell theory - 3
The following is a quote by Democritus (c. 460 c. 370 bce). Paraphrase this quote in your own words in your science journal.
Section 1 Development of the Atomic Theory Bellringer The following is a quote by Democritus (c. 460 c. 370 bce). Paraphrase this quote in your own words in your science journal. Color exists by convention,
2 Copyright Pearson Education, Inc., or its affiliates. All Rights Reserved.
CHEMISTRY & YOU Chapter 4 Atomic Structure 4.1 Defining the Atom 4.2 Structure of the Nuclear Atom How did scientists determine the structures that are inside an atom? X-rays are used to see structures
EARLY VIEWS: The Ancient Greeks
Feb 7 11:59 AM EARLY VIEWS: The Ancient Greeks Empedocles (c. 450 B.C.) proposed Four Element theory he thought that matter was composed of four elements: AIR, EARTH, FIRE and WATER elements mixed together
Nuclear Chemistry. Atomic Structure Notes Start on Slide 20 from the second class lecture
Nuclear Chemistry Atomic Structure Notes Start on Slide 20 from the second class lecture The Birth of an Idea Democritus, 400 B.C. coined the term atom If you divide matter into smaller and smaller pieces,
9.11 Atomic Theory. My Future Matters. Objectives: - SWBAT describe and explain the four historical models of the atom and how they evolved over time.
9.11 Atomic Theory Objectives: - SWBAT describe and explain the four historical models of the atom and how they evolved over time. Read & Analyze: Directions: Read the following text. While you are reading
10/15/2010. First Thoughts. First Thoughts
0/5/200 First Thoughts First Thoughts People began wondering about matter more than 2,500 years ago. Some of the early philosophers thought that matter was composed of tiny particles. They reasoned that
Chemistry. - Many philosophers concluded that matter was composed of things such as earth, -Democritus: -Aristotle: -Dalton:
Chemistry Made by Saleem Abu-Tayeh Chapter 4 - Many philosophers concluded that matter was composed of things such as earth, water, air, and fire. It was also commonly accepted that matter could be endlessly
Who came up with the first theory of atoms?
The Beginnings of Atomic Theory Who came up with the first theory of atoms? In the fourth century BCE, the Greek philosopher Democritus suggested that the universe was made of indivisible units called
atomos is a Greek word which means indivisible
The History of Atomic Theory i.e. the history of the development of thought about what an atom is. 1st timeframe: around 5 B.C. : This was the time of the Ancient Greeks (in Athens, Greece). During the
SCH3U1 This presentation and more can be found at
SCH3U1 Today s Learning goals: Review history of the atomic model Practice using standard atomic notation Introduce radioisotopes This presentation and more can be found at http://lorenowicz.weebly.com
Who came up with the first theory of atoms?
The Beginnings of Atomic Theory Who came up with the first theory of atoms? In the fourth century BCE, the Greek philosopher Democritus suggested that the universe was made of indivisible units called
CHAPTER 4 Atomic Structure
CHAPTER 4 Atomic Structure 4.1 Early Theories of Matter Earth, Water, Air, Fire Matter was thought to be infinitely divisible No method was available to test theories Democritus (460 B.C. 370 B.C.) First
Atomic Models. A model uses familiar ideas to explain unfamiliar facts observed in nature. A model can be changed as new information is collected.
This model of the atom may look familiar to you. This is the Bohr model. In this model, the nucleus is orbited by electrons, which are in different energy levels. Atomic Models A model uses familiar ideas
Investigating Atoms and Atomic Theory
Investigating Atoms and Atomic Theory Students should be able to: Describe the particle theory of matter. PS.2a Use the Bohr model to differentiate among the three basic particles in the atom (proton,
Atomic Theories Chapter 4.1. How do we know about atoms when no one has ever seen inside an atom?
Atomic Theories Chapter 4.1 How do we know about atoms when no one has ever seen inside an atom? Greek Philosopher Democritus Lived 460 370 BCE Believed it is IMPOSSIBLE to divide matter ad infinitum.
4-1 Notes. Defining the Atom
4-1 Notes Defining the Atom Early Models of the Atom All matter is composed of atoms Atoms are the smallest particles of an element that retains their identity in a chemical reaction Greek philosopher
Chapter 2. Atoms and Ions
Chapter 2 Atoms and Ions A History of Atomic Models 400 B.C.E. (Democritus, a early atomist) 1804 (Dalton) Law of Conservation of Mass Antoine Lavoisier 1743-1794 In a chemical reaction, matter is neither
Atomic Theory. Introducing the Atomic Theory:
Atomic Theory Chemistry is the science of matter. Matter is made up of things called atoms, elements, and molecules. But have you ever wondered if atoms and molecules are real? Would you be surprised to
Memorial to a Scientist
Memorial to a Scientist 1. My Question of Inquiry: Use this sheet to outline how you will collect and present the information to the class. My Group s Scientist: 1 Part I: Memorial to a Scientist: John
Unit 2 continued-chemical Foundations Atoms, Ions, &Elements
Unit 2 continuedchemical Foundations Atoms, Ions, &Elements The Elements Most abundant elements in/on Earth: Oxygen 49.2% Silicon25.7% Most abundant in the human body: Oxygen65.0% Carbon18.0 % Hydrogen10.0%
Work hard. Be nice. Name: Period: Date: UNIT 2: Atomic Concepts Lesson 3: Some go through and some don t
Name: Period: Date: UNIT 2: Atomic Concepts Lesson 3: Some go through and some don t Do Now: By the end of today, you will have an answer to: How did the gold foil experiment lead to the modern model of
The idea of an atom began about 400 B.C. with many Greek philosophers, like Democritus, working to figure out what everything was made of.
The idea of an atom began about 400 B.C. with many Greek philosophers, like Democritus, working to figure out what everything was made of. Always move & join together Atomas means indivisible I m Aristotle
Atomic Structure 11/9/04 Name
Atomic Structure 11/9/04 Name Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. The Greek philosopher Democritus coined what word for a tiny
Atomic Theory: Early Models of the Atom:
Atomic Theory: Our next job in Chemistry 11 is to learn about what matter is made of. After we have done this, we can start to understand why matter behaves the way it does. Everything that has volume
SNC1D CHEMISTRY 2/8/2013. ATOMS, ELEMENTS, & COMPOUNDS L Atomic Theory (P ) Atomic Theory. Atomic Theory
SNC1D CHEMISTRY ATOMS, ELEMENTS, & COMPOUNDS L Atomic Theory (P.168-175) Atomic Theory Thousands of years ago Greek philosophers were asking themselves questions like, If you take a gold bar and cut it
5 Early Atomic Theory and Structure
5 Early Atomic Theory and Structure Chapter Outline 5.1 5.2 Electric Charge A. Discovery of Ions 5.3 Subatomic Parts of the Atom Lightning occurs when electrons move to neutralize charge difference between
The Development of Atomic Theory. SCH12U February Mr. Dvorsky
The Development of Atomic Theory SCH12U February 3 2011 Mr. Dvorsky Nearly 2500 years ago Greek philosophers (i.e. Democritus) expressed a belief matter is composed of tiny indivisible particles called
CHEMISTRY. Matter and Change. Table Of Contents. Section 4.1 Early Ideas About Matter. Unstable Nuclei and Radioactive Decay
CHEMISTRY 4 Table Of Contents Matter and Change Section 4.1 Early Ideas About Matter Chapter 4: The Structure of the Atom Section 4.2 Section 4.3 Section 4.4 Defining the Atom How Atoms Differ Unstable
Early Atomic Theories and the Origins of Quantum Theory. Chapter 3.1
Early Atomic Theories and the Origins of Quantum Theory Chapter 3.1 What is Matter Made of? People have wondered about the answer to this question for thousands of years Philosophers Matter is composed
Atomic Pudding Models of the Atom
Atomic Pudding Models of the Atom Think About It The drawing depicts a very tiny sample of gold taken from a gold ring. The spheres in the cube of gold are so small that they cannot be seen. What are the
Exam Accelerated Chemistry Study Sheet Chap 04 The Atom/Periodic Table
Exam Accelerated Chemistry Study Sheet Chap 04 The Atom/Periodic Table Name /87 TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. Correct the False statements by changing
What is the current atomic model?
4.1 Atoms Basic Units of Matter What is the current atomic model? Matter is anything that has mass and takes up space, such as gases, solids, and liquids. Matter is not sound, heat, or light these are
3.1 Early History of Atomic Theories
Figure 1 In Dalton s atomic model, an atom is a solid sphere, similar to a billiard ball. This simple model is still used today to represent the arrangement of atoms in molecules. DID YOU KNOW? William
CLIL Content Language Integrated Learning
Atomos CLIL Content Language Integrated Learning PET - Preliminary English Test Teacher: Mr Pierluigi Stroppa Tutor: Mrs Angela Valentini 1 Investigating atoms You should be able to: Describe the particle
Atoms, Elements, and the Periodic Table
chapter 00 3 3 Atoms, Elements, and the Periodic Table section 1 Structure of Matter Before You Read Take a deep breath. What fills your lungs? Can you see it or hold it in your hand? What You ll Learn
Part 1: Atom Basics. Week 1: Atoms. Part 2: A Short History of Atomic Theory
Part 1: Atom Basics Week 1: Atoms Part 2: A Short History of Atomic Theory Part 1: Atom Basics Part 1: Atom Basics / Objectives After this lesson I can define an atom & its three parts. distinguish the
CHEMISTRY 11 UNIT REVIEW: ATOMIC THEORY & PERIODIC TRENDS
CHEMISTRY 11 UNIT REVIEW: ATOMIC THEORY & PERIODIC TRENDS Atoms Atoms have protons and neutrons located in the nucleus of the atom. Electrons orbit around the nucleus in well-defined paths. Protons have
Topic III Quest Study Guide
Topic III Quest Study Guide A. Early Concepts: Democritus: Democritus: Greek Philosopher 400 B.C. Matter is composed of atoms, which move through empty space Atoms are solid, homogeneous indestructible
Atomic Theory Development
Atomic Theory Development Born as early as 400 BC, it took more than 2000 years before Science was ready to accept the idea of atomic structure of matter and another 150 years to develop a good model!